Excellent response by #88964/Kristen- the article has a list of the "best" and "good" cod liver oils available by country/region.
I use Carlson's. It's "good" according to the WAP folks...I just looked at the label and it comes from cod from "deep, unpolluted waters near Norway" ...but I don't see that it's available in Europe. Go figure!
Reminds me of the time we were on I5 in California's central valley, saw two tomato trucks, full over the top with bright red tomatoes. One going north, one going south....